Motion-picture-projecting device.



R. M. EATON.

MOTION PICTURE PROJECTIN G DEUCE. APPLICATION FILED APR. 16. I917.

1,286,962. Patented Dec. 10, 19 18. 4 5 2 Q 4% MLQM RICHARD MAX EATON,

F NIAGARA FALLS, NEW YORK.

JNIOTION-PI CTURE-PROJECTING DEVICE.

Specification of Letters Patent.

Patented'Dec. 10, 1918.

Application filed April 16, 191?. Serial No. 162,272.

To all whom it may concern:

Be it known that I, RIoHARD MAX EATON, a citizen of the United States, residing at Niagara Falls, in the county of Niagara and State of New York, have invented certain new and useful Improvements in Motion- Picture-Projecting Devices; and I do here by declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

This invention relates to motion picture projecting machines, particularly governing the device which controls the speed of the film while in operation.

Motion picture projecting machines to which my invention relates are now in gen eral use, but my invention is intended generally to make practical and convenient the so-called commercial machines used by industrial establishments for illustrating the manufacture of its product, or schools of instruction where the film may be conveniently slowed down in its speed of operation to permit of better observance of the details of the picture, and at the same time, not decreasing in speed the change from one exposure to the other, but maintaining that a lways at the minimum fraction of time in change; the extended period being only that of the rest period of the picture or exposure.

This method of control however, may be adapted to any motion picture machine with equal advantage to the product produced upon the screen.

The invention will probably be better understood from a description of the preferred construction illustrated in thedrawings, in which Figure 1 represents a side elevation of my improved device. illustrating it in combination with one of the ordinary film conveying drums of a motion picture projecting machine.

Fig.

Figs. larged views of the the arm; and

Fig. represents a plan view of the parts illustrated in Fig. 3.

Similar numerals of reference refer to like parts throughout the specification and drawings.

I will now describe the specific devices of :2 represents a plan view of the same. 3 and 4 represent fragmentary enfilm conveying drum and the drawings, reserving it to the claims to point out novel features and to define the scope of the invention, it being understood that the claims will be given the due range of equivalents to which they may be entitled in view of'the art.

Referring to the drawings, 1 represents a strip of photographic film as used in motion picture projection machines; .2 represents the carrying or conveyingdrum, provided with the usual projections, which engage with the apertures common in the film for conveying the same.

The side of the drum is provided witha plurality of outwardly projecting pins, preferably eight in number, and lettered respectively, 3, 4c, 5, 6, 7, 8, 9 and 10. The conveying drum may be provided with a clockspring propelling mechanism, the tension of which may be maintained by the motor or crank operating shaft 11.

My improved control comprises an electro-magnetically operating sliding arm 12,

magnet 1% which may be energized and deenergized in any desired or well known manner, said arm being provided with an opening 15 extending in 'ardly from one side thereof, to permit the pins 3 to 10 inclusive, to pass therethrough.

It will thus be seen that a reciprocating movement is imparted to the arm12 due to the vibrations of the armature 13 by the closing of the electric circuit, which may be accomplished in any desired or convenient manner, thereby permitting the pins 3 to 10 inclusive, to pass through the opening 15 in the arm 12 when said opening in the arm 12. through the vibration of the armature 13, comes in line with each one of said pins.

In order to control the speed of the vibrations of the armature 13, I secure thereto in any desired or convenient manner, a steel reed 16. upon which is mounted an adjustable weight 17. ward or away from the armature 13, the speed of the vibrations of the armature may be controlled.

Referring to Fig. l of the drawings, it will be noted that the pin 5 is ready to drop through the opening 15 in the arm 12 when the operating tension is on the film conveying drum 2. After the pin 5 has passed through the opening 15 in the arm 12, the

By moving the weight to- I exact details of conveying drum by the speed the speed of the armature 13 'cient .one, p the preferred embodiment of pin 4 will rest upon-the top of the arm 12, until the opening 15 is in line with the pin 4, due to the reciprocating movement of the arm 12, when it will pass therethrough. If therefore, the armature vibrates eight times during one second, the eight pins in the film will have passed through the open1ng'15 during one revolution of said drum.

When the curren armature 13 begins vibrating, the film conveying drum 2 will be controlled of the vibrating armature. The traveling period of the film conveying drum 2 will not be lessened in speed regardless'of and arm 12, but the only period of operation of the drum 2 that will be retarded by slowing the vibration of the armature 13, will be the rest period, or in other words, the period at which the picture is projected on the screen for the vision.

18 represents a source of light; 19 represents a condenser lens, and 20 represents a series of regular projecting lenses, the operation of which do not necessarily have to be described, as they are common in devices of the character to which my invention relates.

Experience has demonstrated that the organization above described is a highly efiiand while the device described is my present inlimited to the construction, combination, and arrangement herein set forth, it being obvious that minor variations thereof, not involving the exercise of invention, may be made by any skilled mechanic, and such departures from what is herein described and claimed I consider within the 'scope and terms of my claims.

Having thus described my invention, what is turned on and the 'ention', I do not wish to be the speed of .arm and I desire to claim and secure by Letters Patent is y 1. In combination with the cooperating elements of motion picture projecting devices-of the character described, a film conveying drum provided with a plurality of outwardly projecting pins, a sliding arm electro-magnetically operated, said arm provided with an opening to permit said pins to pass therethrough, and a variable speed vibrating reed electro-magnetically operated adapted to control the speed of said sliding arm and film while in operation.

2. In combination with the cooperating elements of motion picture projecting de vices of the character described, a veying ments, a reciprocating arm electro-inagnetically operated, said arm being provided with a tapering opening to permit said pins to pass thereth'rough, a vibrating reed, a movable weight carried by said reed, said reed being electro-magnetically operated thereby controlling the speed of said reciprocating arm and film while. in operation.

3. In combination with the cooperating elements of motion picture projecting evices of the character described, a film conveying drum provided with engaging elements, a reciprocating arm which engages with said engaging elements, and a variable speed vibrating reed, said arm and reed beingelectro-mechanically operated thereby controlling the speed of said reciprocating film while in operation.

This specification signe and witnessed this 4th day of April, 1917.

I RICHARD MAX EATON.

Witnesses STACIA WHISTLER, STANLEY SILVERTHORN. 

